Method of grinding rolls.



- 0.]11. NORTON METHOD or GRINDING" ROLLS.

A PPLIOATIOH FILED SEPT. 19, 1913.

1,09 1 9 Batented'May 12, 1914.

2 SHEETS-SHEET 1.

' N M 9 2265565 N g Patented May 12, 1914.

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- p. H. NORTON v METHOD OF GRINDING ROLLS. APPLICATION FILEDSEPT-19,1913

muumu UNITED STATES PATENT OFICE.

CHARLES H. NoaToN, or WORCESTER, MASSACHUSETTS, ASSIGNOR To NoaToNGRINDING COMPANY, or WORCESTER, MASSACHUSETTS, A CORPORATION orMASSACHUSETTS.

METHOD OF GRINDING ROLLS.

Specification of Letters Patent.

Patented May 12, 1914.

Original application filed June 14, 1911, Serial No. 633,021. Dividedand this application filed September 19, 1913. Serial No. 790,804.

To all whom it may concern:

Be it known that I, CHARLES H. NORTON, a citizen of the United States,residing at \Vorcester, in the county of Worcester and State ofMassachusetts, have invented a new and useful Method of Grinding Rolls,of which the following is a specification.

This invention relates to a method of grinding rolls and constitutes adivision of my prior application, SerialNo. 633,021,

filed June 145, 1911.

The object of my invention is to provide an improved method of grindingrolls by which rolls of the character hereinafter described can bequickly, accurately and economically reground.

The rolls to which my improved method is articularlyapplicable are ofrelatively arge size andweight and are widely used in rolling metal, inmilling, crushing and grinding machinery, in printing and paper makingmachines, and in many other lines of, industry. ArolLof this characterusually comprises a central cylindrical portion and cylindrical bearingsof reduced size at the ends of the central portion. The roll may also beprovided with extensions beyond the hearings to which drivingconnections may be fitted. Such rolls are usually originally turned andground upon centers but as they are subject to great pressure and strainwhen in use, the working peripheries rapidly lose their exact shape andrequire regrinding. In some lines of work this has to be done very oftenas the nature-of the work requires that the rolls be kept to exactcylindrical shape, even to the thousandth vof an inch or less. Theregrinding of these rolls involves considerable difficulty astheoriginal centers are sometimes cutoff after the roll is made and ifthis is not done, the centers are. often bruised or their accuracyisotherwise destroyed. The regrinding of the roll upon its originalcenters is usually impracticable andth'e present practice is to supportand rotate the roll on its bearings fectly cylindrical surface. Itshould also be noted that the working periphery is usually ofconsiderably larger than the bearing surface and that any irregularityin the bearings may be. magnified at the working periphery, thusproduc-.

ing greater inaccuracies in the working surfaces than are present in thebearing surfaces. I have discovered that this.regrind- 1ng operation maybevery successfully performed by supporting a roll on the periphery ofits bearings, rotating the same while thus supported, grinding theperiphery of the bearings while it is thus supported and rotated, andthereafter regrinding the working surfaces of the roll while it issupported and rotated upon its reground and accurate bearings. It isfound in actual practice that when this method of procedure is used boththe bearing and the working sfirfaces can be brought to exactcylindrical s ape.

My improved method can -perhaps be best understood by reference to theaccompanying drawings illustrating one form of machine by the use ofwhich themethod can be practised.

In the drawings Figure 1 is a top plan view ofa portion of a grindingmachine;

diameter Fig. 2 is an end elevation of the same; and

Fig. 3 is a detail sectional view of one of the bearing supportingmembers.

Referring to Fig. 1, the letter R indicates the central or workingportion of a roll having cylindrical bearing members 13 and also havingextensions E by which. the roll may be driven. Any common form ofactuating means (not shown) may be utilized to rotate the roll upon itsbearings. A grinding wheel is indicated at 7W, mountedupon a support 10which is carried by a table 11, which in turn is arranged to slidelongitudinally upon ways 12 and 13 secured to the main frame 1 1 of thegrinding machine. Feeding mechanism indicated at 15 is provided by whichthe wheel W may be caused to advance or recede with respect to the workand a feed screw 16, shown in Fig. 1, provides means for moving thewheel table longitudinally of the work. The bearings B of the roll aresupported upon a plurality of radially adjustable bearing members 17mounted in radial slots in a bearing frame 18 which may be arranged forlongitudinal adjustment along a guide 19 formed integrally with theframe 14. Each bearing member, as shown in Fig. 3, is provided upon itsrear side with a pair of inclined surfaces 20 which rest upon a pair ofoppositely disposed wedge shaped blocks 21 which are mounted to slidelongitudinally of the radial slots. A compound right and left hand screw22 is threaded into openings in each pair of the blocks 21 and is provided with a collar 23 received within a slot in the frame 18. Thecollar serves to prevent longitudinal movement of the screw relative tothe frame 18 and it will be evident that rotation of the screw when thusconfined will result in simultaneous, longitudinal movement of theblocks 21 and in radial adjustment of the member 17.

An extension 2 upon the screw provides for the attachment of a Wrenchfor its convenient manipulation. It will be noted byreference to Fig. 2that the upper bearing members 17 at the front of the hearing aredisposed in a plane substantially below'the center of the roll R. Thisarrangement permits the wheel to be advanced to the position indicatedby dotted lines at W without interference of the bearing members withthe operation of the wheel in 'rinding the surface B. The bearing memersat the rear of the machine are disposed" in a somewhat higher plane tocounteract the thrust of the grinding wheel against the roll. In thepractice of my improved method by the use of this machine the bearings Barefirst calipered and the supports 17 are then adjusted bythe use ofany convenient setting mechanism so that they will be arranged-on an arcslightly less in diameter than the dia eter of the bearings B indicatedat l/V and the working periphery of the roll is ground while itcontinues to rotate upon its resurfaced bearings. The roll is thusrestored to its original accuracy of cylindrical form both with respectto its bearings and also with respect to its Working periphery and it isalso reground so that its bearings and its working periphery aredeveloped upon the same axial line.

I do not wish my improvedmethod of grinding rolls to be limitedin anyWay by the apparatus herein disclosed as it is evident that many otherforms of apparatus might be designed by those skilled in the art by theuse of which this method might be carried out -without departing fromthe spirit and scope of my invention, but

What I do claim is l. The method of grinding the bearings of a rollwhich consists insupporting and rotating a roll on the peripheries ofits bearin s and 'rindin said bearin 's while the b b b 23 roll is thussupported and rotated.

2. The method of grinding a roll whic consists in supportin and rotatingthe same on the peripheries 'o.' its bearings, grinding said bearingswhile the roll is thus supported and rotated and then grinding theworking periphery of the roll while the same is retated on itsresurfaced bearings.

' 3. The method of grinding a roll which consists in supporting androtatin the same on its bearings on a plurality 0 supports adjusted toarcs slightly smaller in diameter than the diameter of said bearingsgrinding said bearings until the same are cylindrical and run truly onsaid supports and roll while the same is rotated on its resurfacedbearings.

41. The method of grinding rolls which then grinding the workingperipheryof the consists of calipering its bearings; setting a pluralityof radially adjustable supports to an are slightly less in diameter thanthe diameter of said bearings, rotating said roll on its bearings onsaid supports, grinding said bearings to cylindrical form of the samediameter as said adjusted supports, and then grinding the workingperiphery of the roll while it is rotated on its resurfaced bearings insaid supports.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

CHARLES H. NORTON, Witnesses:

ALFRED J. Doriui, J. llnunniir JoI-iNsoN.

